多年生人工草地矮生嵩草(Kobresia humilis)种群空间格局与种内关联性

植物种群空间分布格局不仅反映植物的空间分布特点，还有助于研究者了解植物利用资源的现状和生存能力。本研究以矮生嵩草(Kobresia humilis)为研究对象，按株丛斑块面积将矮生嵩草分为小斑块级株丛(0～30 cm²)、中斑块级株丛(30～80 cm²)和大斑块级株丛(>80 cm²)3个株丛级，采用点格局分析的g函数统计方法，分析了矮生嵩草各级株丛的空间格局及关联性。结果表明：矮生嵩草种群中小斑块级株丛占比高于中斑块、大斑块级株丛占比，种群中幼苗充足，正处于稳定的增长阶段；矮生嵩草小斑块、中斑块、大斑块级株丛在小尺度范围内表现为聚集分布，随着尺度的增大，所有株丛斑块的聚集程度减弱，逐渐趋向于随机分布；小斑块与中斑块、大斑块的矮生嵩草株丛在小尺度内表现为正关联。斑块聚集分布和相互共存是矮生嵩草的一种生存策略。

Spatial Distribution Pattern and Intraspecific Association of Kobresia humilis in Perennial Artificial Grassland

Kobresia humilis is the dominant species in alpine meadows that has the characteristics of strong cold endurance,drought resistance,and grazing tolerance.K.humilis plays an important role in animal husbandry production,soil and water conservation,and ecological restoration.The spatial distribution pattern of plant population not only reflects the spatial distribution characteristics of plants but also helps to understand the status quo and viability of plant utilization resources.K.humilis was taken as the research object in this study.Three cluster degrees consisting of small patch degree cluster(0~30 cm²),middle patch degree cluster(30~80 cm²),large patch degree cluster(>80 cm²)were classified according to the individual cluster diameter.The spatial pattern and intraspecific association of K.humilis among different degree clusters were analyzed by adopting the method of point pattern analysis and the g-function statistic.The results showed that:the proportion of small patch degree clusters in the K.humilis population was higher than the proportions of the middle patch and large patch degree clusters.There were sufficient seedlings in the population and it was in a steady growth stage.The spatial pattern of the small patch,middle patch,and large patch degree clusters were firstly aggregated distribution and gradually transitioned to random distribution.The small patch,middle patch,and large patch degree clusters showed a positive correlation in a small scale.The patch aggregation distribution and mutualistic symbiosis are a survival strategy of K.humilis in perennial artificial grassland.